If you've seen the previews you don't need to read a review.
Although the film was nearly 3 hours long, I felt that it went by without feeling dragged on. There will always be downsides to anything so I won't be the one to tell you what wasn't good. I'll simply tell you that the movie was phenomenal and will without a doubt recommend this. I'm looking forward to watching this for the second time. I heard that the 3D version isn't all that different from the standard version so I think I'll save the couple of dollars and watch the standard one next.